1# This shell script emits a C file. -*- C -*-
2#   Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004
3#   Free Software Foundation, Inc.
4#
5# This file is part of GLD, the Gnu Linker.
6#
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program; if not, write to the Free Software
19# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20#
21
22# This file is sourced from elf32.em, and defines extra arm-elf
23# specific routines.
24#
25cat >>e${EMULATION_NAME}.c <<EOF
26
27static int no_pipeline_knowledge = 0;
28static char *thumb_entry_symbol = NULL;
29static bfd *bfd_for_interwork;
30
31static void
32gld${EMULATION_NAME}_before_parse (void)
33{
34#ifndef TARGET_			/* I.e., if not generic.  */
35  ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
36#endif /* not TARGET_ */
37  config.dynamic_link = ${DYNAMIC_LINK-TRUE};
38  config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
39}
40
41static void
42arm_elf_after_open (void)
43{
44  if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
45    {
46      /* The arm backend needs special fields in the output hash structure.
47	 These will only be created if the output format is an arm format,
48	 hence we do not support linking and changing output formats at the
49	 same time.  Use a link followed by objcopy to change output formats.  */
50      einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
51      return;
52    }
53
54  {
55    LANG_FOR_EACH_INPUT_STATEMENT (is)
56      {
57	bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
58      }
59  }
60
61  /* Call the standard elf routine.  */
62  gld${EMULATION_NAME}_after_open ();
63}
64
65static void
66arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
67{
68  if (statement->header.type == lang_input_section_enum
69      && !statement->input_section.ifile->just_syms_flag)
70    {
71      asection *i = statement->input_section.section;
72      asection *output_section = i->output_section;
73
74      ASSERT (output_section->owner == output_bfd);
75
76      if ((output_section->flags & SEC_HAS_CONTENTS) != 0
77	  && (i->flags & SEC_NEVER_LOAD) == 0
78	  && ! i->owner->output_has_begun)
79	{
80	  bfd_for_interwork = i->owner;
81	  bfd_for_interwork->output_has_begun = TRUE;
82	}
83    }
84}
85
86static void
87arm_elf_before_allocation (void)
88{
89  bfd *tem;
90
91  /* Call the standard elf routine.  */
92  gld${EMULATION_NAME}_before_allocation ();
93
94  if (link_info.input_bfds != NULL)
95    {
96      /* The interworking bfd must be the last one in the link.  */
97      bfd_for_interwork = NULL;
98      for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
99	tem->output_has_begun = FALSE;
100
101      lang_for_each_statement (arm_elf_set_bfd_for_interworking);
102      for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
103	tem->output_has_begun = FALSE;
104
105      /* If bfd_for_interwork is NULL, then there are no loadable sections
106	 with real contents to be linked, so we are not going to have to
107	 create any interworking stubs, so it is OK not to call
108	 bfd_elf32_arm_get_bfd_for_interworking.  */
109      if (bfd_for_interwork != NULL)
110	bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
111    }
112  /* We should be able to set the size of the interworking stub section.  */
113
114  /* Here we rummage through the found bfds to collect glue information.  */
115  /* FIXME: should this be based on a command line option? krk@cygnus.com  */
116  {
117    LANG_FOR_EACH_INPUT_STATEMENT (is)
118      {
119	if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
120						      no_pipeline_knowledge))
121	  {
122	    /* xgettext:c-format */
123	    einfo (_("Errors encountered processing file %s"), is->filename);
124	  }
125      }
126  }
127
128  /* We have seen it all. Allocate it, and carry on.  */
129  bfd_elf32_arm_allocate_interworking_sections (& link_info);
130}
131
132static void
133arm_elf_finish (void)
134{
135  struct bfd_link_hash_entry * h;
136
137  /* Call the elf32.em routine.  */
138  gld${EMULATION_NAME}_finish ();
139
140  if (thumb_entry_symbol == NULL)
141    return;
142
143  h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
144			    FALSE, FALSE, TRUE);
145
146  if (h != (struct bfd_link_hash_entry *) NULL
147      && (h->type == bfd_link_hash_defined
148	  || h->type == bfd_link_hash_defweak)
149      && h->u.def.section->output_section != NULL)
150    {
151      static char buffer[32];
152      bfd_vma val;
153
154      /* Special procesing is required for a Thumb entry symbol.  The
155	 bottom bit of its address must be set.  */
156      val = (h->u.def.value
157	     + bfd_get_section_vma (output_bfd,
158				    h->u.def.section->output_section)
159	     + h->u.def.section->output_offset);
160
161      val |= 1;
162
163      /* Now convert this value into a string and store it in entry_symbol
164	 where the lang_finish() function will pick it up.  */
165      buffer[0] = '0';
166      buffer[1] = 'x';
167
168      sprintf_vma (buffer + 2, val);
169
170      if (entry_symbol.name != NULL && entry_from_cmdline)
171	einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
172	       thumb_entry_symbol, entry_symbol.name);
173      entry_symbol.name = buffer;
174    }
175  else
176    einfo (_("%P: warning: connot find thumb start symbol %s\n"),
177	   thumb_entry_symbol);
178}
179
180EOF
181
182# Define some shell vars to insert bits of code into the standard elf
183# parse_args and list_options functions.
184#
185PARSE_AND_LIST_PROLOGUE='
186#define OPTION_THUMB_ENTRY		301
187'
188
189PARSE_AND_LIST_SHORTOPTS=p
190
191PARSE_AND_LIST_LONGOPTS='
192  { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
193  { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
194'
195
196PARSE_AND_LIST_OPTIONS='
197  fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
198  fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
199'
200
201PARSE_AND_LIST_ARGS_CASES='
202    case '\'p\'':
203      no_pipeline_knowledge = 1;
204      break;
205
206    case OPTION_THUMB_ENTRY:
207      thumb_entry_symbol = optarg;
208      break;
209'
210
211# We have our own after_open and before_allocation functions, but they call
212# the standard routines, so give them a different name.
213LDEMUL_AFTER_OPEN=arm_elf_after_open
214LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
215
216# Replace the elf before_parse function with our own.
217LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
218
219# Call the extra arm-elf function
220LDEMUL_FINISH=arm_elf_finish
221